Sound-recording and reproducing mechanism.



I No.842,028. PATENTED JAN. 22, 1907 E. P. SHUB.

- SOUND RECORDING AND'RBPRODUGING MECHANISM.

- APPLICATION FILED SEPT. 18, 1905.

' which a flatdisk isemployed'for receiving a 'diaphraginfor asullici'ent d'istance to pre- To all whom it n'my conceive rsafrhs PM INT EFICE.

EDWARD-F." s nus, or WASHINGTON, nis'r uc'r oFcoLu eiA.

iLSOUND-RECQRDING AND REPRODUGiNG MECHANISM.

Specification of Letters Patent.

Patented than. 22, 1907.

Applicaticii filed September 18, 1305. Serial No. 278,968.

'1 3e itknown that. I, ED ARD F. Seen, a citizen of" the -UnitedlStates, residing at 1Wiishi1igton, District of (Lolumbia, have in.-

ventedfnew and useful I'm irovemcnts ll].

r o .v i J bound Record ngand Repro ucing Mecham,

"isms; of whichwhe "following is a specification. v

"This invention relates to talking; ma- 011111168, more particularly tothat type in record in the form ofa laterally wavy spiral groove ofuniform depth cutinto the disk by a stvlus operated, by a vibratingdiaphragm.- The oblejctoftheinventiou [to improve the reproduction ofrecorded soundfbyproviding'suitable means of simpl construction attachedto the diaphragm of a e and positive talking-fmlachinewhich wit l causethe recording or'trans'cr bing stylus to travel in a direc- "tion at aright anglc to the vibratory movement ofthe diaphragm and with a shorterl -amplitude of"vihration. [With this construction is combil'icd' astraight, uninterrupted passage 'for the sound-haves from the italkingnachine with my invention applied thereto. Fig. Q'isa plan View of thesame. Fig.3 is a front'view of cording'and reproducing mechanism onenview ci a detail of the intention.

Fig. 41s a sidefview of the.

5 is a plan Fig. 6 is a sectional View on the line (1/0. oflFigi .4.

the sound-box and restantially in the planeof the diaphragm 7 is'ournaled a vertical pivot or shaft 14, preterably contained within acasing] The ends ofsaid pivot are pointed and rest in sockets formed inthe ends of adjustingscrews 16,.

passing through the top and-bottom of. the casing 15. In place of thecasing lugs may project from the side 01 the sound-box to receive'thescrews. Secured to, the Vertical pivot His a stylus-]e*ver 25, one arm17 extending horizontally in front of the diaphragm 7 and-attachedthereto at its center and so shaped that it Will\ pass around-the edgeof the sound-box without touching it. A SGCUIldl or stylus arm 18projects downwardly and forwardly at an angle to said pivot/in thedirection ofrotatich of the record-disk and forms a right angle with thearm 17 when seen in plan- The stylus-arm 18 carriesa styl us 19,adjustable within said arm 18 and secured thereto by a-thumbscrew 20.The stylus-arm 18 and stylus 19 are in the same vertical plane as thepivot 14, but n tan angle thereto, as clearly illustrated in Figs'l and4. A's'thus arranged the stylus 19 as it follows the wavy groove in theinvention furtl'ier consists in the con- 5 combination; and arrangementof parts, such as will be fully described herein 3 after and pointed outin the 'cl record-disk oscillates the vertical pivot14 in a horizontaldirecti0n, which in turn vibrates the horizontal arm 17 and thediaphragm 7., to whichsaid arm is attached.

It is to be observed that the oint of attachment of the arm 17 to thediaphragm is I at a'gre'ater' distance from the axis of the pivot- 14than is the point of the stylus 19.

This is important from the fact that-When 1 extend" d an anismtorrotating; recc'rdfdislg 2. I recording and reproducing mechanism isindicatedat 3, attached to thejhorn t or other normal position, -a flatsprmg 22, secured to sbuhdieceiver by means of a hall-j oint 5.

The i The recording and reproducing mechanj ism 3ccmpjrises a sound b'oxGot the usual cylindrical form ;"carrying a 'Vihratory dia- I phragm 7and a' n from the rear 10f thefsound-bo'x in a straight line andbpeningthereinto behind the dia- Ph m On'one side of the sound-box 6 andsubtube 8 projecting central ly theiuachine is making a record the amlitude ofvibrationof the stylus point is ess than. that of the:diaphragm, from Whiph it followsv that [when the record. is reproducedthe stylus; has ajshorter' distance to travel thenwould'be the case ifthe arms 17" and 18 equal distancefrom their axis. By this constructiona better and purer tone is produced and the life'of the record-disk isincreased.

'To restrain the amplitude of vibration of the stylus. 19 and re'turnthe diaphragm 7 to other soundere'ceiver an adapted; to slide or fit'over'or within the tube 8; has secured to it one of the elements of theball joint 5, the

other PlOI'HUH'l. it) hising attached to thesnmll nd ol the horn 4. Theinner eltunent It) on tho slvovo 8'! consists ol a. thin splusro,

pi lvriihly ol liltiill, mounted on tho and of said slorvo whit-h [mSHsentirely through tho Silllflt, us indivutozl. in Fl 4', This outer t(-nuent H) is ol luunisplu-rioal form, with, projw-ting hugs il slightlythicker than this rest oi the (airmen! on ranch side and a sortkot orout-away portion 1! on tho top. Fig. rnngrd that vviu n assembled thovdo not con tau-t oxorpt Ill. tho pivotod points and run ho wavy grooveon the record-disk when repro- (liming sound and when inscrihing arecord to lorm ii groove rxiiotiy in harn'iony with tho vibratingdiaphragm. The find of the horn at its attachment tothe element .10- isslightly iurgrr than tho and of sleme 5-) 450 (Her: 'llnrlmi'u-nts 1!?and it)" are so m tors.

Having thus described my invention, I

or of tho disk it wiil describe an :i-rr (sou dotted lino, Fig. 2)passing through tluaxis of the record-(11s 2. It is to ho ohsvrvod thatthe stylus does not lie in tho axis ol' thr sound-box, but outsidvthereof, v wlzith zirrzingt-nuent tends to draw the rorordin;andreproducing dvvim: toward thr mentor of too rvrord-disk as tho luttorrotates.

From (hr ronstrurwtion iiiiovo drsnrihrd it will ho notvd that itstraight unohstructvd pnssugo-wny for the sound-waves produrvri, trotlroin nurvvs and other impodiinonts vxhirh tend to-hreuk up and nudili:tho sound produced h the vibrating diaphragm. 'liu: joint 5 as lor'nrzlpurniirs'tlustylus to mow: \vil ll grout i'roodoin in a verticaldirorclion, hut holds it lirinly against any side play,

sotlmt it ist-oinpr-llrd to :urrurutr-lv lollowtiw permit the sound-wowsto on without obstruction.

'ilu: stylus i!) may he readily removed from the rr-oord-disk byswinging the recording and ro n-oducing nieohanisn'i 3 in an upwarddirection on tho joint 5, where it heid h tnie sookrt 1 1, into whit'htho sleeve 9 entor the hairn oluini l. in it sound recording andreproducing HHPlIZLHiSlH, it sound-hox, a Vertically-tliw :osoddiaphragm tnotlntif-ii therein, astylusl(\'('l' pivotzilly inountrd uponsaidsonnd-hox and having its :ivotal axis in the samgplane its limit oi"the i'l iuphriigm, one arm of said levrr ('UIH'HN'iOIl to said diaphragmand the other or stylus :1 'moi said lever projecting downwardly at an:iuiite angie to thozixis of said pivot and having: its r220 find nearerto said pivotal axis than the free and of this lirst-nmntiorwd arm ofsaid lover.

'2. in a sound recording and roproduriing inrolmnisin, u sound-box, o.vibratory diaphragm thorvin, a vertical pivot lying in the plznm of saiddiiipl'iragm, a styluslever mounted on said pivot, one arm of whichlevar is attached to the diiiplnugm, the other and shortor armmrrying astylus, and a cen- Hiring-spring attachud at one mid to said sounrhhoxand hearing at its other and against a flattened portion on the pivot.

,ln testimony whereof I tiiiiifi my signature in prcsrnoo of twosubscribing witnesses.

- EIHYARD SilUl}. Witn A'SI Hunt )3. STERLING, if. (.I Brumsrt.

